摘要
以杨木碱性过氧化氢机械浆(APMP)、化学热磨机械浆(CTMP)、硫酸盐浆(KP)和麦草CTMP 4种浆为原料,对纸浆在应用生物酶漂白前利用离子液体进行温和预处理,控制离子液体BmimC l用量为1.0%(以绝干纸浆质量计,下同)、EmimD MP用量为1.2%,研究发现离子液体预处理可明显改善纸浆的酶漂效果,且EmimD MP的效果更优。表现为应用离子液体预处理后成纸的光学性能及物理强度明显改善,EmimD MP预处理后杨木KP浆白度可提高4.27%(ISO),不透明度增加了2.46%,麦草CTMP成纸的抗张指数、耐破指数、环压指数、撕裂指数及耐折度分别增加12.21%、29.80%、22.45%、44.82%和52.50%。纤维质量分析仪(FQA)、X射线衍射(XRD)和扫描电镜(SEM)分析结果显示,离子液体处理后4种纸浆纤维质量提高,平均长度增加,细小纤维含量降低,纤维结晶度提高,其中EmimD MP处理后杨木KP浆结晶度提高了11.21%,纸浆表面发生明显分丝帚化,增加了药液的渗透能力。
Using aspen alkaline peroxide mechanical pulp （APMP）, chemithermomechanical pulp （CTMP）, kraft pulp （KP） and wheat straw CTMP as material, before enzymatic bleaching, the pulp was moderately pretreated by ionic liquids of BmimCl 1.0% （relative to the amount of dry pulp, the below was the same ） and EmimDMP 1.2%, respectively. The results showed that ionic liquids could optimize the pulp enzymatic bleaching properties, and EmimDMP gave better results. The whiteness of poplar kraft pulp（KP） increased by 4.27 % （ISO）, opaqueness increased by 2.46%, and the tensile index, burst index, ring crush index, tear index as well as the folding number of wheat straw chemithermomechanical pulp（CTMP） forming paper increased by 12.21%, 29.80 %, 22.45 %, 44.82 % and 52.50 %, respectively, after the pretreatment of EmimDMP. The fiber quality analysis（FQA）, X-ray diffraction （XRD）, and scanning electron microscope （SEM） were employed to characterize its properties. Mter pretreated with ionic liquid, there was a improvement of fiber quality with the average length increasing, the fines content reducing, and the fiber crystalline increasing. The crystalline of EmimDMP pretreated poplar KP increased by 11.21%. The surface of pulp occured obvious fibrillation, and this phenomenon could increase the penetration of liquids.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2015年第4期79-84,共6页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(31270627
31370580)
关键词
离子液体
预处理
生物酶漂白
ionic liquids
pretreatment
enzymatic bleaching
